フッ素イオン導入法による永久歯齲蝕予防の臨床実験的研究

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A series of clinical experiments were undertaken to assess the possible effects of fluoride ions impregnation of vital tooth crown on the rate of caries inhibition, with use of the Fluoridator (Orion Corp.) and 2% sodium fluoride solution. The experimental group was consisted of 450 pupils from the Ist to 6th grades of the elementary school of Ogura, Yawata-ku, and a total of 590 pupils of similar composition was taken as the control group from Kumate elementary school, Yawata-ku, Kitakyushu City. The experiment was started October, 1970 and terminated at February, 1973, during which interval the fluoride treatment was regularly administered at the months of February, June and October each year, so that the number of treatments given the subjects was respectively 3 for the Ist grade pupils, 6 for the 2nd grade pupils and 8 for the 3rd to 6th grades pupils. Examinations of the permanent teeth of subjects were conducted at the months of February, June and October each year with special reference to the number of total erupted permanent teeth and the number of DMF-T in individual subjects. Results were summarized as follows. 1. Caries Prevarence Rate at Biginning of the Experiment The caries rate of permanent teeth refers to percentages between the total existent permanent teeth and the number of DMF-T (present at the start of experiment). The percentages for the male subjects ranged from 6.7 to 14.5% in the experimental groups, and 3.2 to 26.6% in the control groups. The same for the female subjects ranged from 7.2 to 16.4% in the experimental groups, and 6.4 to 21.9% in the control groups. This indicated that, with both sexes, the rates for the control groups were higher than those for the experimental groups within 5% of statistical error. 2. Rate of Inhibition of Permanent Teeth Caries by Fluoride The rate of caries inhibition refers here to the percentage of the difference between the incidence rates of permanent teeth caries for both experimental and control groups of subjects versus those of control groups. The rate of caries inhibition for the male subjects was highest in the Ist grade pupils with 48.5%, followed by 3rd grade pupils with 24.9%, by 5 th grade pupils with 23.0%, the rate decreasing gradually for remaining groups of pupils in the order of 4th, 2nd and 6th grade. The rate of caries inhibition for the female subjects was highest in the 4th grade pupils with 50.6%, followed by 5th grade pupils with 32.1%, by 3rd grade pupils with 30.6% and by Ist grade pupils with 21.9%, the rate decreasing for 6th and 2nd grades pupils in this order. The correlation between the fluoride treatment and incidence of permanent teeth caries was examined by x^2-Test. Results showed that correlations existed in the 1st and 3rd grades pupils of male sex and in the 3rd and 4th grades pupils of female sex with statistical error within 5%. Any positive correlation could not be recognized to exist in the remaining groups of subject.
九州歯科学会の論文
1973-07-31

フッ素イオン導入法による永久歯齲蝕予防の臨床実験的研究

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